As Finding Dory’s release date inches closer and closer to its release date, Sia has debut her cover of “Unforgettable” for the animated sequel. Performing the song on Ellen, whose host is the voice of the titular character, Sia delivers a chilling rendition of the song made famous by Nat King Cole and later by his daughter, Natalie Cole.

“Dory’s story makes me teary. When Ellen asked me, I couldn’t refuse!” Sia explains of why she agreed to sing the track.

“Dory’s story makes a lot of people teary,” DeGeneres quips.

Taking place six months after the events in 2003’s Finding Nemo, Finding Dory centers around Dory’s quest to find her parents at the Marine Biology Institute of California. The flick will open on June 17.